Herrerasaurus (pronounced huh-Rare-uh-Sore-us) was one the earliest dinosaurs to have walked on the face of the Earth. It lived in what is now Argentina and was a meat-eater, also known as a carnivore.

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Herrerasaurus was likely up to 10 to 20 feet (3 to 6 meters) in length, walked on its hind legs with short thighs and rather long feet. It was very quick on its feet and had strong claws for grabbing prey. Herrerasaurus weighed at least 400 pounds and at most 750 pounds.

Herrerasaurus was a meat-eater. It probably fed on small and medium-sized animals. However, it most likely did not hunt for itself, instead it probably ate meat off dead animals. It has been suggested it fed on rhynchosaurs, small prehistoric lizards, and aetosaurs, a kind of mix between an armadillo and a pig.